Fatigue testing device for bone fracture plate

Abstract

The utility model discloses a fatigue testing device for a bone fracture plate, which is used for fatigue testing of the bone fracture plate and comprises a base provided with a placing station used for placing the bone fracture plate; the rotary driving mechanism is arranged on the base; the cam is connected to the rotation driving mechanism, the rotation driving mechanism drives the cam to rotate around the horizontal axis, and the cam is located above the placing station; the sliding block is connected to the base in an up-down sliding mode, and the sliding block is located between the placing station and the cam; the number of the adjusting blocks is multiple, the multiple adjusting blocks are different in height, and any adjusting block is detachably connected to the top of the sliding block. According to the fatigue testing device for the bone fracture plate, the appropriate adjusting block can be selected according to the thickness or the width of the personalized bone fracture plate, so that fatigue testing can be conveniently carried out on the front face or the side face of the personalized bone fracture plate of different sizes through the same device. The fatigue testing device can be applied to the field of fatigue testing devices.

Description

Technical Field

[0001] The utility model relates to the field of fatigue testing devices, and particularly to a fatigue testing device for bone plates. Background Art

[0002] With the increasing maturity of 3D printing technology, 3D printing technology is increasingly applied to medical devices. 3D personalized bone plates can fit well with bones. Compared with traditional bone plates, 3D printed personalized bone plates have certain advantages in terms of product aesthetics and surgical operation difficulty. The only drawback is that the mechanical properties of 3D printed products are generally inferior to those of products manufactured by traditional processing. Therefore, improving the mechanical properties of 3D printed products is an urgent problem to be solved at present. Improving the mechanical properties of bone plates mainly includes the design of product dimensions, the design of 3D printing manufacturing processes, and the design of post-processing processes. For these factors, a large number of tests need to be carried out on different product dimensions, different 3D printing manufacturing processes, and different post-processing processes in the early stage to achieve the optimal design of the mechanical properties of the product.

[0003] The existing fatigue test of bone plates generally uses four-point bending loading force for testing, and special fixtures are required to position the four loading points of the bone plate during the test. However, due to the relatively complex shape of the personalized bone plate made by 3D printing, the parameters such as the thickness, width, and length of the bone plate are different from those of the general bone plate, and the special fixtures for the existing general bone plate are difficult to adapt to the personalized bone plate. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fatigue testing device for bone plates to solve one or more technical problems existing in the prior art, and at least provide a beneficial choice or create conditions.

[0005] The technical solution adopted to solve the above technical problems:

[0006] A fatigue testing device for bone plates is used for the fatigue test of bone plates. The fatigue testing device for bone plates includes:

[0007] A base is provided with a placement station for placing the bone plate;

[0008] A rotation driving mechanism is arranged on the base;

[0009] A cam is connected to the rotation driving mechanism. The rotation driving mechanism drives the cam to rotate around a horizontal axis, and the cam is located above the placement station;

[0010] A slider is connected to the base in a vertically sliding manner, and the slider is located between the placement station and the cam;

[0011] Adjusting blocks, there are multiple adjusting blocks, and the heights of the multiple adjusting blocks are different from each other. Any one of the adjusting blocks is detachably connected to the top of the slider.

[0012] The beneficial effects of the present utility model are as follows: Place the personalized bone plate made by 3D printing at the placement station, select an adjusting block with an appropriate height and install it on the top of the slider. After the rotation driving mechanism is started, the cam rotates. During the rotation of the cam, it will press against the adjusting block, thereby applying pressure to the bone plate. Therefore, an appropriate adjusting block can be selected according to the thickness or width of the personalized bone plate, so as to facilitate fatigue testing of the front or side of personalized bone plates of different sizes through the same device.

[0013] As a further improvement of the above technical solution, the bone plate fatigue testing device further includes roller shafts. There are two roller shafts, and the two roller shafts are respectively detachably arranged on the front and rear sides of the placement station.

[0014] As a further improvement of the above technical solution, a groove is provided on the top surface of the placement station, and the roller shaft is placed in the groove.

[0015] As a further improvement of the above technical solution, there are multiple types of grooves, and the multiple types of grooves are arranged in sequence in the front-rear direction.

[0016] As a further improvement of the above technical solution, the diameters of the multiple roller shafts are different from each other.

[0017] As a further improvement of the above technical solution, a plurality of protrusions are provided on the outer peripheral surface of the cam, and the rotation trajectory of each protrusion intersects with the top of the adjusting block.

[0018] As a further improvement of the above technical solution, the multiple protrusions are evenly spaced along the circumferential direction of the cam, and the shapes of the multiple protrusions are the same.

[0019] As a further improvement of the above technical solution, two pressing blocks are provided at the bottom of the slider and are spaced apart from each other in the front-rear direction. The pressing blocks are semi-cylindrical, and the diameter of the pressing block is equal to that of the roller shaft.

[0020] As a further improvement of the above technical solution, the loading force of the bone plate is determined by the size and shape of the cam, the pressure angle between the cam and the adjusting block, and the driving torque of the rotation driving mechanism.

[0021] As a further improvement of the above technical solution, the cam is detachably connected to the rotation driving mechanism. There are multiple cams, and the outer diameters of the multiple cams are different from each other. Description of the Drawings

[0022] The following further describes the present utility model in conjunction with the drawings and embodiments;

[0023] Figure 1 is a structural schematic diagram of an osteosynthesis plate fatigue testing device provided by the present utility model, showing one embodiment thereof;

[0024] Figure 2 is a working schematic diagram of an osteosynthesis plate fatigue testing device provided by the present utility model, showing one embodiment thereof. In order to facilitate observing the contact form between the osteosynthesis plate and the slider, the placement station is rotated by 90° so that the extending direction of the osteosynthesis plate is parallel to the axis of the cam.

[0025] 1. Base, 101. First fixing hole, 102. Second fixing hole, 103. Groove, 104. Guide block, 2. Rotation driving mechanism, 3. Cam, 4. Adjusting block, 5. Slider, 6. Osteosynthesis plate, 7. Roller shaft. Detailed implementation manners

[0026] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the drawings. The role of the drawings is to supplement the description in the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it should not be construed as a limitation on the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that for orientation descriptions, such as up, down, front, back, left, right, etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present utility model.

[0028] In the description of the present utility model, if there are descriptions with words such as "several", its meaning is one or more, and the meaning of multiple is more than two. Understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number.

[0029] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0030] Referring to Figures 1 to 2 , the following embodiments are made for the osteosynthesis plate fatigue testing device of the present utility model:

[0031] The osteosynthesis plate fatigue testing device includes a base 1, a rotation driving mechanism 2, a cam 3, an adjusting block 4, and a slider 5.

[0032] The base 1 is provided with a placement station.

[0033] The rotation drive mechanism 2 is connected to the top of the base 1, and the rotation drive mechanism 2 is located at the periphery of the placement station.

[0034] The rotation drive mechanism 2 can be a drive motor with a speed reducer, a servo motor and other devices. The rotation drive mechanism 2 is provided with a drive shaft, and the drive shaft extends upward above the placement station and extends in the left - right direction.

[0035] The cam 3 is connected to the drive shaft of the rotation drive mechanism 2. The drive shaft of the rotation drive mechanism 2 drives the cam 3 to rotate, and the cam 3 is arranged above the placement station.

[0036] The slider 5 is slidably connected to the base 1. The slider 5 slides in the up - down direction, and the slider 5 is arranged in the space between the placement station and the cam 3.

[0037] There are multiple adjusting blocks 4, and the heights of the multiple adjusting blocks 4 in the up - down direction are different from each other.

[0038] The top of the slider 5 is detachably connected to any one of the adjusting blocks 4, and the height of the adjusting block 4 is selected according to the size of the bone plate 6.

[0039] Place the personalized bone plate 6 made by 3D printing at the placement station, select an adjusting block 4 with a suitable height and install it on the top of the slider 5. After the rotation drive mechanism 2 is started, it drives the cam 3 to rotate. During the rotation of the cam 3, it will press against the adjusting block 4, and then press the bone plate 6.

[0040] Therefore, a suitable adjusting block 4 can be selected according to the thickness or width of the personalized bone plate 6, so as to facilitate the fatigue test of the front or side of personalized bone plates 6 with different sizes through the same device.

[0041] In some embodiments, a roller 7 is respectively arranged on the front and rear sides of the placement station. The roller 7 extends in the left - right direction, the roller 7 is located at the top of the placement station, and the two rollers 7 respectively support the front and rear ends of the bone plate 6.

[0042] Use the two rollers 7 to support the front and rear ends of the bone plate 6, and the roller 7 can be disassembled for replacement and maintenance, avoiding the influence on the fatigue test of the bone plate 6 after the roller 7 is damaged by long - term pressure.

[0043] In some embodiments, a groove 103 is opened on the top surface of the placement station, and the roller 7 is installed in the groove 103 to limit the roller 7 by using the groove 103.

[0044] The disassembly and assembly of the roller 7 are more convenient.

[0045] In some embodiments, there are multiple grooves 103 on the top surface of the placement station, and the multiple grooves 103 are spaced apart in the front - rear direction.

[0046] The groove 103 at the corresponding position can be selected according to the length of the bone plate 6, and then the roller shaft 7 is installed in the selected groove 103, so as to facilitate the fatigue test of the personalized bone plate 6 with different lengths.

[0047] In some embodiments, a plurality of roller shafts 7 are provided, and the outer diameters of the plurality of roller shafts 7 are different from each other.

[0048] According to the aperture of the connection hole in the bone plate 6 and the hole pitch between every two connection holes, a roller shaft 7 with a suitable outer diameter is selected and installed on the placement station to adapt to the personalized bone plate 6 with a complex structure.

[0049] In some embodiments, a plurality of protrusions are provided on the outer peripheral surface of the cam 3, and the rotation trajectory of each protrusion after rotation intersects with the top of the adjusting block 4.

[0050] When the rotary drive mechanism 2 drives the cam 3 to rotate around the axis extending in the left - right direction, when the cam 3 rotates one week, the plurality of protrusions sequentially press against the adjusting block 4, and then apply multiple loading forces to the bone plate 6, so as to improve the efficiency of the fatigue test and save the time of the fatigue test.

[0051] In some embodiments, the shapes of the plurality of protrusions are the same, and the plurality of protrusions are circumferentially arrayed on the outer periphery of the cam 3.

[0052] Ensure that the same loading force is provided when all the protrusions press against the adjusting block 4, and ensure that the duration of the loading force is the same, and ensure that the time interval between every two times of providing the loading force is the same, so as to ensure the accuracy of the fatigue test of the bone plate 6.

[0053] In some embodiments, two pressing blocks are provided at the bottom of the slider 5. The pressing blocks are semi - cylindrical, the axis of the pressing blocks extends in the left - right direction, the two pressing blocks are distributed on the front and rear sides of the slider 5, and the diameter of the pressing blocks is the same as the diameter of the selected roller shaft.

[0054] Use the two pressing blocks to apply pressure to the bone plate 6, which meets the requirements of the fatigue test of the bone plate 6.

[0055] In some embodiments, the top of the adjusting block 4 is spherical.

[0056] When the cam 3 presses against the top of the adjusting block 4, the spherical surface helps to reduce the scratching between the cam 3 and the top of the adjusting block 4.

[0057] In some embodiments, the loading force of the bone plate is jointly determined by the size and shape of the cam, the pressure angle between the cam and the adjusting block, and the driving torque of the rotary drive mechanism.

[0058] Accurately calculate the loading force of the bone plate through the size and shape of the cam, the pressure angle between the cam and the adjusting block, and the driving torque of the rotary drive mechanism.

[0059] In some embodiments, the cam 3 is detachably connected to the rotary drive mechanism 2, and a plurality of cams 3 with different outer diameters are provided.

[0060] A cam 3 with a suitable outer diameter is selected according to the thickness or width of the personalized bone plate 6 and installed on the rotary drive mechanism 2 so as to adapt to personalized bone plates 6 of different sizes.

[0061] Specifically, referring to Figure 1 and Figure 2 as shown, the bone plate fatigue testing device includes a base 1, a rotary drive mechanism 2, a cam 3, an adjusting block 4, a slider 5, and a roller 7.

[0062] The base 1 is provided with a placement station.

[0063] The rotary drive mechanism 2 is connected to the top of the base 1, and the rotary drive mechanism 2 is located outside the placement station.

[0064] The base 1 is provided with a first fixing hole 101 extending in the left - right direction, and the rotary drive mechanism 2 is fixed to the base 1 by bolts passing through the first fixing hole 101. The base 1 is provided with a second fixing hole 102 penetrating in the up - down direction, and the base 1 is locked to the test table by bolts passing through the second fixing hole 102.

[0065] The top surface of the placement station is provided with a variety of grooves 103, and the variety of grooves 103 are spaced apart in the front - back direction.

[0066] Among them, one groove 103 of the same type is respectively provided on the front and back sides of the placement station, so as to place the same roller 7 in the two grooves 103 of the same type, and the shape of the roller 7 matches the shape of the groove 103.

[0067] The top surface of the placement station is provided with a guide block 104, and the guide block 104 is located in the middle of the placement station.

[0068] The rotary drive mechanism 2 can be a driving motor with a speed reducer, a servo motor and other devices. The rotary drive mechanism 2 is provided with a drive shaft, and the drive shaft extends above the placement station and extends in the left - right direction.

[0069] A plurality of cams 3 with different outer diameters are provided, and a cam 3 with a suitable outer diameter is connected to the drive shaft of the rotary drive mechanism 2 by screws.

[0070] Each cam 3 is provided with four protrusions on its outer peripheral surface. The four protrusions have the same shape, and the four protrusions are circumferentially arranged on the outer periphery of the cam 3, and the rotation trajectory of each protrusion after rotation intersects with the adjusting block 4.

[0071] When the rotation drive mechanism 2 drives the cam 3 to rotate around an axis extending in the left - right direction, as the cam 3 rotates one full circle, the four protrusions sequentially press against the adjustment block 4, thereby applying four loading forces to the bone plate 6, so as to improve the efficiency of fatigue testing and save the time of fatigue testing.

[0072] The slider 5 is slidably connected to the guide block 104 of the base 1, enabling the slider 5 to slide in the up - down direction. The slider 5 is arranged in the space between the placement station and the cam 3.

[0073] There are multiple adjustment blocks 4, and the heights of the multiple adjustment blocks 4 in the up - down direction are different from each other. The top of each adjustment block 4 is spherical.

[0074] An installation hole is provided at the top of the slider 5. An adjustment block 4 with a suitable height is placed into the installation hole, and the height of the adjustment block 4 is selected according to the size of the bone plate 6.

[0075] Two pressing blocks are provided at the bottom of the slider 5. The pressing blocks are semi - cylindrical, and the axes of the pressing blocks extend in the left - right direction. The two pressing blocks are distributed on the front and rear sides of the slider 5.

[0076] Multiple roller shafts 7 are provided, and the outer diameters of the multiple roller shafts 7 are different from each other. Two roller shafts 7 with suitable outer diameters are selected and respectively installed into the two grooves 103 at the placement station, and the two roller shafts 7 are located on the front and rear sides of the slider 5.

[0077] The diameter of the pressing block is the same as the diameter of the selected roller shaft 7. That is to say, the corresponding slider 5 can be selected according to the diameter of the roller shaft 7 to ensure that the diameter of the pressing block at the bottom of the slider 5 is the same as the diameter of the roller shaft 7.

[0078] According to the aperture of the connection holes in the bone plate 6 and the hole pitch between every two connection holes, a roller shaft 7 with a suitable outer diameter is selected to adapt to the personalized bone plate 6 with a complex structure.

[0079] The present invention aims to provide a device for quickly and comprehensively testing the fatigue performance of a bone plate. The rotation drive mechanism 2 and the cam 3 are used for transmission to provide a loading force to the bone plate 6. Through the base 1 and various adjustment components such as cams 3 with different outer diameters, adjustment blocks 4 with different heights, roller shafts 7 with different diameters, grooves 103 at different positions, etc., the bone plate 6 can be subjected to fatigue testing in the direction of being placed face - up or side - up. The side - up loading conforms to the actual clinical stress situation of the bone plate 6, and can more reasonably analyze the side - face fatigue fracture performance of the structure of the bone plate 6.

[0080] The groove 103 of the placement station of the base 1 can place rollers 7 with different diameters to be applicable to the tests of bone plates 6 with different hole pitches. Specifically for the 3D printed bone plate 6, its 3D printing process will affect the residual stress of each surface of the bone plate 6. By testing the bone plate 6 with a smaller thickness and width specification through this device, a better processing technology can be quickly screened out, and thus the fatigue test cycle of the bone plate 6 is greatly shortened.

[0081] The preferred embodiments of the present utility model have been specifically described above, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent variations or substitutions without departing from the spirit of the present utility model, and these equivalent variations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A bone plate fatigue test device, characterized in that: For the fatigue test of the bone plate, the bone plate fatigue test device includes: A base provided with a placement station for placing the bone plate; A rotary drive mechanism provided on the base; A cam connected to the rotary drive mechanism, the rotary drive mechanism driving the cam to rotate about a horizontal axis, and the cam being located above the placement station; A slider slidably connected to the base up and down, the slider being located between the placement station and the cam; Adjusting blocks, there are multiple adjusting blocks with different heights, and any one of the adjusting blocks is detachably connected to the top of the slider.

2. The bone plate fatigue testing device according to claim 1, characterized in that: The bone plate fatigue test device further includes roller shafts, there are two roller shafts, and the two roller shafts are respectively detachably arranged on the front and rear sides of the placement station.

3. The bone plate fatigue testing device according to claim 2, characterized in that: A groove is provided on the top surface of the placement station, and the roller shaft is placed in the groove.

4. The bone plate fatigue testing device according to claim 3, wherein: There are multiple types of grooves, and the multiple types of grooves are arranged in sequence in the front-rear direction.

5. The bone plate fatigue testing device according to claim 2, wherein: The diameters of the multiple roller shafts are different from each other.

6. The bone plate fatigue testing device according to claim 1, wherein: A plurality of protrusions are provided on the outer peripheral surface of the cam, and the rotation trajectory of each protrusion intersects with the top of the adjusting block.

7. The bone plate fatigue testing device according to claim 6, wherein: The multiple protrusions are evenly spaced along the circumferential direction of the cam, and the shapes of the multiple protrusions are the same.

8. The bone plate fatigue testing device according to claim 1, wherein: Two pressing blocks spaced apart front and rear are provided at the bottom of the slider, the pressing blocks are semi-cylindrical, and the diameter of the pressing block is equal to that of the roller shaft.

9. The bone plate fatigue test device according to claim 1, characterized in that: The loading force of the bone plate is determined by the size and shape of the cam, the pressure angle between the cam and the adjusting block, and the driving torque of the rotary drive mechanism.

10. The bone plate fatigue test device according to claim 1, characterized in that: The cam is detachably connected to the rotary drive mechanism, there are multiple cams, and the outer diameters of the multiple cams are different from each other.

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